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sswv 09-04-2023 12:15 AM
How to make VDPAU work properly on Thinkpad T480 with Debian 12?
 
I am using a Lenovo Thinkpad T480 laptop with Debian 12 (bookworm). The laptop has 2 graphics cards: Intel UHD Graphics 620 and NVidia GP108M (GeForce MX150). I have installed both drivers by apt-get and they appear to be working fine.

Code:
$ lspci | grep -e NV -e UHD
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
01:00.0 3D controller: NVIDIA Corporation GP108M [GeForce MX150] (rev a1)
Then I installed VAAPI and VDPAU by apt-get. VAAPI seems to be working fine. "vainfo -a" shows correct info of the Intel graphics card; "mpv --hwdec=vaapi" shows the correct debug info and plays big video smoothly.

However, I think VDPAU is not working properly. The problems include:

(1) When using the Intel graphics card, "vdpauinfo" shows only a small sub-set of the decoder capabilities, while most of them are "not supported".

Here VDPAU is using VAAPI as the backend (by libvdpau-va-gl1). "vainfo -a" shows that H264 4096x4096 and HEVC 8192x8192 are supported, but "vdpauinfo" seems that only H264 2048x2048 is supported, while HEVC is not supported.

I tested VLC (with VDPAU set) and verified the cases described by the two commands.

For a 1920x1080 H264 video, it worked well:
Code:
[00007f3d50004940] gl gl: Initialized libplacebo v4.208.0 (API v208)
libva info: VA-API version 1.17.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_17
libva info: va_openDriver() returns 0
[00007f3d60c10a90] avcodec decoder: Using OpenGL/VAAPI backend for VDPAU for hardware decoding
For a 3840x1920 H264 video, it failed:
Code:
[00007fccccc0fa70] avcodec decoder: Using OpenGL/VAAPI backend for VDPAU for hardware decoding
[h264 @ 0x7fccccd39d80] Failed setup for format vdpau: hwaccel initialisation returned error.
[00007fccccc0fa70] avcodec decoder error: existing hardware acceleration cannot be reused
For an HEVC video, it also failed:
Code:
[00007f45b0c1fcf0] avcodec decoder: Using OpenGL/VAAPI backend for VDPAU for hardware decoding
[hevc @ 0x7f45b0d44340] Failed setup for format vdpau: hwaccel initialisation returned error.
[00007f45b0c1fcf0] avcodec decoder error: existing hardware acceleration cannot be reused
I am wondering: since VAAPI has these capabilities, why VDPAU cannot use them? How can I make VDPAU
support these capabilities?

(2) I am not sure how to use VDPAU with the NVidia graphics card. I tried "VDPAU_DRIVER=nvidia vdpauinfo", but it reported:
Code:
display: :0  screen: 0
GPU at BusId 0x1 doesn't have a supported video decoder
Error creating VDPAU device: 1
I think the NVidia graphics is working with proper driver, because "nvidia-smi" and "nvidia-settings" show the corrent info. How can I make VDPAU work on this graphics card?

Thanks!

P.S. This is the "vainfo -a" output:
Code:
$ vainfo -a
libva info: VA-API version 1.17.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_17
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.17 (libva 2.12.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 23.1.1 ()
vainfo: Supported config attributes per profile/entrypoint pair
VAProfileMPEG2Simple/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 2048
    VAConfigAttribMaxPictureHeight        : 2048
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileMPEG2Main/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 2048
    VAConfigAttribMaxPictureHeight        : 2048
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileH264Main/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
                                            VA_DEC_SLICE_MODE_BASE
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileH264Main/VAEntrypointEncSliceLP
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
    VAConfigAttribRateControl              : VA_RC_CQP
    VAConfigAttribEncPackedHeaders        : VA_ENC_PACKED_HEADER_SEQUENCE
                                            VA_ENC_PACKED_HEADER_PICTURE
                                            VA_ENC_PACKED_HEADER_SLICE
                                            VA_ENC_PACKED_HEADER_MISC
                                            VA_ENC_PACKED_HEADER_RAW_DATA
    VAConfigAttribEncInterlaced            : VA_ENC_INTERLACED_NONE
    VAConfigAttribEncMaxRefFrames          : l0=3
                                            l1=0
    VAConfigAttribEncMaxSlices            : 3
    VAConfigAttribEncSliceStructure        : VA_ENC_SLICE_STRUCTURE_EQUAL_ROWS
                                            VA_ENC_SLICE_STRUCTURE_MAX_SLICE_SIZE
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribEncQualityRange          : number of supported quality levels is 7
    VAConfigAttribEncQuantization          : VA_ENC_QUANTIZATION_TRELLIS_SUPPORTED
    VAConfigAttribEncIntraRefresh          : VA_ENC_INTRA_REFRESH_ROLLING_COLUMN
                                            VA_ENC_INTRA_REFRESH_ROLLING_ROW
    VAConfigAttribEncSkipFrame            : supported
    VAConfigAttribEncROI                  : num_roi_regions=3
                                            roi_rc_priority_support=0
                                            roi_rc_qp_delta_support=1
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_ENCODE
    VAConfigAttribEncDirtyRect            : number of supported regions is 4
    VAConfigAttribEncParallelRateControl  : number of supported layers is 1
    VAConfigAttribFEIMVPredictors          : number of supported MV predictors is 4
    VAConfigAttribMaxFrameSize            : max_frame_size=1
                                            multiple_pass=1

VAProfileH264High/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
                                            VA_DEC_SLICE_MODE_BASE
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileH264High/VAEntrypointEncSliceLP
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
    VAConfigAttribRateControl              : VA_RC_CQP
    VAConfigAttribEncPackedHeaders        : VA_ENC_PACKED_HEADER_SEQUENCE
                                            VA_ENC_PACKED_HEADER_PICTURE
                                            VA_ENC_PACKED_HEADER_SLICE
                                            VA_ENC_PACKED_HEADER_MISC
                                            VA_ENC_PACKED_HEADER_RAW_DATA
    VAConfigAttribEncInterlaced            : VA_ENC_INTERLACED_NONE
    VAConfigAttribEncMaxRefFrames          : l0=3
                                            l1=0
    VAConfigAttribEncMaxSlices            : 3
    VAConfigAttribEncSliceStructure        : VA_ENC_SLICE_STRUCTURE_EQUAL_ROWS
                                            VA_ENC_SLICE_STRUCTURE_MAX_SLICE_SIZE
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribEncQualityRange          : number of supported quality levels is 7
    VAConfigAttribEncQuantization          : VA_ENC_QUANTIZATION_TRELLIS_SUPPORTED
    VAConfigAttribEncIntraRefresh          : VA_ENC_INTRA_REFRESH_ROLLING_COLUMN
                                            VA_ENC_INTRA_REFRESH_ROLLING_ROW
    VAConfigAttribEncSkipFrame            : supported
    VAConfigAttribEncROI                  : num_roi_regions=3
                                            roi_rc_priority_support=0
                                            roi_rc_qp_delta_support=1
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_ENCODE
    VAConfigAttribEncDirtyRect            : number of supported regions is 4
    VAConfigAttribEncParallelRateControl  : number of supported layers is 1
    VAConfigAttribFEIMVPredictors          : number of supported MV predictors is 4
    VAConfigAttribMaxFrameSize            : max_frame_size=1
                                            multiple_pass=1

VAProfileJPEGBaseline/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_YUV444
                                            VA_RT_FORMAT_YUV411
                                            VA_RT_FORMAT_YUV400
                                            VA_RT_FORMAT_RGB16
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecJPEG                  : VA_ROTATION_NONE
                                            VA_ROTATION_90
                                            VA_ROTATION_180
                                            VA_ROTATION_270
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 16384
    VAConfigAttribMaxPictureHeight        : 16384
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileJPEGBaseline/VAEntrypointEncPicture
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_YUV444
                                            VA_RT_FORMAT_YUV411
                                            VA_RT_FORMAT_YUV400
                                            VA_RT_FORMAT_RGB16
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribEncPackedHeaders        : VA_ENC_PACKED_HEADER_RAW_DATA
    VAConfigAttribMaxPictureWidth          : 16384
    VAConfigAttribMaxPictureHeight        : 16384
    VAConfigAttribEncJPEG                  : rithmatic_coding_mode=0
                                            progressive_dct_mode=0
                                            non_interleaved_mode=0
                                            differential_mode=0
                                            differential_mode=0
                                            max_num_components=3
                                            max_num_scans=1
                                            max_num_huffman_tables=2
                                            max_num_quantization_tables=3
    VAConfigAttribEncQualityRange          : number of supported quality levels is 1

VAProfileH264ConstrainedBaseline/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
                                            VA_DEC_SLICE_MODE_BASE
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileH264ConstrainedBaseline/VAEntrypointEncSliceLP
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
    VAConfigAttribRateControl              : VA_RC_CQP
    VAConfigAttribEncPackedHeaders        : VA_ENC_PACKED_HEADER_SEQUENCE
                                            VA_ENC_PACKED_HEADER_PICTURE
                                            VA_ENC_PACKED_HEADER_SLICE
                                            VA_ENC_PACKED_HEADER_MISC
                                            VA_ENC_PACKED_HEADER_RAW_DATA
    VAConfigAttribEncInterlaced            : VA_ENC_INTERLACED_NONE
    VAConfigAttribEncMaxRefFrames          : l0=3
                                            l1=0
    VAConfigAttribEncMaxSlices            : 3
    VAConfigAttribEncSliceStructure        : VA_ENC_SLICE_STRUCTURE_EQUAL_ROWS
                                            VA_ENC_SLICE_STRUCTURE_MAX_SLICE_SIZE
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribEncQualityRange          : number of supported quality levels is 7
    VAConfigAttribEncQuantization          : VA_ENC_QUANTIZATION_TRELLIS_SUPPORTED
    VAConfigAttribEncIntraRefresh          : VA_ENC_INTRA_REFRESH_ROLLING_COLUMN
                                            VA_ENC_INTRA_REFRESH_ROLLING_ROW
    VAConfigAttribEncSkipFrame            : supported
    VAConfigAttribEncROI                  : num_roi_regions=3
                                            roi_rc_priority_support=0
                                            roi_rc_qp_delta_support=1
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_ENCODE
    VAConfigAttribEncDirtyRect            : number of supported regions is 4
    VAConfigAttribEncParallelRateControl  : number of supported layers is 1
    VAConfigAttribFEIMVPredictors          : number of supported MV predictors is 4
    VAConfigAttribMaxFrameSize            : max_frame_size=1
                                            multiple_pass=1

VAProfileVP8Version0_3/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 4096
    VAConfigAttribMaxPictureHeight        : 4096
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileHEVCMain/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_RGB32
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING
    VAConfigAttribMaxPictureWidth          : 8192
    VAConfigAttribMaxPictureHeight        : 8192
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileHEVCMain10/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV420_10
                                            VA_RT_FORMAT_YUV420_10BPP
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING
    VAConfigAttribMaxPictureWidth          : 8192
    VAConfigAttribMaxPictureHeight        : 8192
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileVP9Profile0/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_YUV420_10
                                            VA_RT_FORMAT_RGB32
                                            VA_RT_FORMAT_YUV420_10BPP
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
                                            VA_DEC_SLICE_MODE_BASE
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 8192
    VAConfigAttribMaxPictureHeight        : 8192
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE

VAProfileVP9Profile2/VAEntrypointVLD
    VAConfigAttribRTFormat                : VA_RT_FORMAT_YUV420
                                            VA_RT_FORMAT_YUV422
                                            VA_RT_FORMAT_YUV420_10
                                            VA_RT_FORMAT_RGB32
                                            VA_RT_FORMAT_YUV420_10BPP
    VAConfigAttribDecSliceMode            : VA_DEC_SLICE_MODE_NORMAL
                                            VA_DEC_SLICE_MODE_BASE
    VAConfigAttribDecProcessing            : VA_DEC_PROCESSING_NONE
    VAConfigAttribMaxPictureWidth          : 8192
    VAConfigAttribMaxPictureHeight        : 8192
    VAConfigAttribProcessingRate          : VA_PROCESSING_RATE_DECODE
This is the "vdpauinfo" output:
Code:
$ vdpauinfo
display: :0  screen: 0
libva info: VA-API version 1.17.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_17
libva info: va_openDriver() returns 0
API version: 1
Information string: OpenGL/VAAPI backend for VDPAU

Video surface:

name  width height types
-------------------------------------------
420    4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16
422    4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16
444    4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16
420_16  4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16
422_16  4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16
444_16  4096  4096  NV12 YV12 UYVY YUYV Y8U8V8A8 V8U8Y8A8 NV24 YV24 P010 P016 Y_U_V_444_16

Decoder capabilities:

name                        level macbs width height
----------------------------------------------------
MPEG1                          --- not supported ---
MPEG2_SIMPLE                  --- not supported ---
MPEG2_MAIN                    --- not supported ---
H264_BASELINE                  51 16384  2048  2048
H264_MAIN                      51 16384  2048  2048
H264_HIGH                      51 16384  2048  2048
VC1_SIMPLE                    --- not supported ---
VC1_MAIN                      --- not supported ---
VC1_ADVANCED                  --- not supported ---
MPEG4_PART2_SP                --- not supported ---
MPEG4_PART2_ASP                --- not supported ---
DIVX4_QMOBILE                  --- not supported ---
DIVX4_MOBILE                  --- not supported ---
DIVX4_HOME_THEATER            --- not supported ---
DIVX4_HD_1080P                --- not supported ---
DIVX5_QMOBILE                  --- not supported ---
DIVX5_MOBILE                  --- not supported ---
DIVX5_HOME_THEATER            --- not supported ---
DIVX5_HD_1080P                --- not supported ---
H264_CONSTRAINED_BASELINE      51 16384  2048  2048
H264_EXTENDED                  --- not supported ---
H264_PROGRESSIVE_HIGH          --- not supported ---
H264_CONSTRAINED_HIGH          --- not supported ---
H264_HIGH_444_PREDICTIVE      --- not supported ---
VP9_PROFILE_0                  --- not supported ---
VP9_PROFILE_1                  --- not supported ---
VP9_PROFILE_2                  --- not supported ---
VP9_PROFILE_3                  --- not supported ---
HEVC_MAIN                      --- not supported ---
HEVC_MAIN_10                  --- not supported ---
HEVC_MAIN_STILL                --- not supported ---
HEVC_MAIN_12                  --- not supported ---
HEVC_MAIN_444                  --- not supported ---
HEVC_MAIN_444_10              --- not supported ---
HEVC_MAIN_444_12              --- not supported ---
AV1_MAIN                      --- not supported ---
AV1_HIGH                      --- not supported ---
AV1_PROFESSIONAL              --- not supported ---

Output surface:

name              width height nat types
----------------------------------------------------
B8G8R8A8        16384 16384    y
R8G8B8A8        16384 16384    y
R10G10B10A2      16384 16384    y
B10G10R10A2      16384 16384    y
A8              16384 16384    y

Bitmap surface:

name              width height
------------------------------
B8G8R8A8        16384 16384
R8G8B8A8        16384 16384
R10G10B10A2      16384 16384
B10G10R10A2      16384 16384
A8              16384 16384

Video mixer:

feature name                    sup
------------------------------------
DEINTERLACE_TEMPORAL            -
DEINTERLACE_TEMPORAL_SPATIAL    -
INVERSE_TELECINE                -
NOISE_REDUCTION                  -
SHARPNESS                        -
LUMA_KEY                        -
HIGH QUALITY SCALING - L1        -
HIGH QUALITY SCALING - L2        -
HIGH QUALITY SCALING - L3        -
HIGH QUALITY SCALING - L4        -
HIGH QUALITY SCALING - L5        -
HIGH QUALITY SCALING - L6        -
HIGH QUALITY SCALING - L7        -
HIGH QUALITY SCALING - L8        -
HIGH QUALITY SCALING - L9        -

parameter name                  sup      min      max
-----------------------------------------------------
VIDEO_SURFACE_WIDTH              -
VIDEO_SURFACE_HEIGHT            -
CHROMA_TYPE                      -
LAYERS                          -

attribute name                  sup      min      max
-----------------------------------------------------
BACKGROUND_COLOR                -
CSC_MATRIX                      -
NOISE_REDUCTION_LEVEL            -
SHARPNESS_LEVEL                  -
LUMA_KEY_MIN_LUMA                -
LUMA_KEY_MAX_LUMA                -

business_kid 09-09-2023 02:41 PM
Hello, sswv & welcome to LQ.

Don't get too hung up on vdpau. VLC on my RazPi 4 looks for libvdpau_vc4.so and fails to find it. It isn't actually a thing, it doesn't exist, But vlc soldiers on.

If I read between the lines that Intel thing is an integrated graphics chip in your APU? In which case it's assigned basically zero watts. My old integrated HD4000 ran on about 5 watts :mad: Settle for the hdmi-1.x; don't go looking for 4k on that, the results could well be embarrassing. Why do you think Intel started buying cores from AMD?


Info like 2048² or 16384² aren't much use. Here's a better way to suss your capability out: What's the card's max dotclock? Then grab a calculator and the modeline
Code:
"1920x1080": 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x68 0x5
The figures I have in bold mean
  • 60 = 60Hz Refresh rate
  • 148500 = 148500KHz or 148.5Mhz which is the dotclock required for this mode.
  • 2200 = full length of the "1920" line including invisible portions.
  • 1125 = full length of the "1080" bit including invisible portions.
So the dotclock is calculated by
Code:
2200x1125x60 = 148500KHz or 148.5 Mhz
Now 4k usually runs at 120Hz refresh. Just doubling those figures to estimate 4k and using 120hz refresh gives 1,188Mhz as the required dotclock. I don't think you're at the races.


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