[Bug 68651] KMS+Intel 9600M on Toshiba C75 A 13Q

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68651

--- Comment #18 from Paulo Zanoni <przanoni at gmail.com> ---
Hi

Just to confirm: this problem does not happen on the HDMI output, right?

Another question: if you just try to change the screen resolution to something
that's not the original one, does it work fine? What happens if you get back to
the initial resolution?


I see the BIOS boots with real 18bpp, no dithering:

[    6.383733] [drm:intel_dump_pipe_config], [CRTC:3][setup_hw_state] config
for pipe A
[    6.383734] [drm:intel_dump_pipe_config], cpu_transcoder: P
[    6.383735] [drm:intel_dump_pipe_config], pipe bpp: 18, dithering: 0
[    6.383736] [drm:intel_dump_pipe_config], fdi/pch: 0, lanes: 0, gmch_m: 0,
gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[    6.383738] [drm:intel_dump_pipe_config], dp: 1, gmch_m: 3627723, gmch_n:
8388608, link_m: 201540, link_n: 524288, tu: 64
[    6.383739] [drm:intel_dump_pipe_config], requested mode:
[    6.383741] [drm:drm_mode_debug_printmodeline], Modeline 0:"" 0 0 1600 0 0 0
900 0 0 0 0x0 0x0
[    6.383742] [drm:intel_dump_pipe_config], adjusted mode:
[    6.383744] [drm:drm_mode_debug_printmodeline], Modeline 0:"" 0 0 0 0 0 0 0
0 0 0 0x0 0xa
[    6.383746] [drm:intel_dump_crtc_timings], crtc timings: 0 1600 1648 1680
1860 900 902 908 930, type: 0x0 flags: 0xa
[    6.383747] [drm:intel_dump_pipe_config], port clock: 0
[    6.383748] [drm:intel_dump_pipe_config], pipe src size: 1600x900
[    6.383749] [drm:intel_dump_pipe_config], gmch pfit: control: 0x00000000,
ratios: 0x00000000, lvds border: 0x00000000
[    6.383751] [drm:intel_dump_pipe_config], pch pfit: pos: 0x00000000, size:
0x00000000, disabled
[    6.383752] [drm:intel_dump_pipe_config], ips: 0


But later we try to configure 18bpp with dithering:

[    6.396748] [drm:intel_dump_pipe_config], [CRTC:3][modeset] config for pipe
A
[    6.396749] [drm:intel_dump_pipe_config], cpu_transcoder: P
[    6.396750] [drm:intel_dump_pipe_config], pipe bpp: 18, dithering: 1
[    6.396751] [drm:intel_dump_pipe_config], fdi/pch: 0, lanes: 0, gmch_m: 0,
gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[    6.396753] [drm:intel_dump_pipe_config], dp: 1, gmch_m: 3023102, gmch_n:
4194304, link_m: 167950, link_n: 262144, tu: 64
[    6.396754] [drm:intel_dump_pipe_config], requested mode:
[    6.396756] [drm:drm_mode_debug_printmodeline], Modeline 0:"1600x900" 60
103790 1600 1648 1680 1860 900 902 908 930 0x48 0xa
[    6.396757] [drm:intel_dump_pipe_config], adjusted mode:
[    6.396759] [drm:drm_mode_debug_printmodeline], Modeline 0:"1600x900" 60
103790 1600 1648 1680 1860 900 902 908 930 0x48 0xa
[    6.396761] [drm:intel_dump_crtc_timings], crtc timings: 103790 1600 1648
1680 1860 900 902 908 930, type: 0x48 flags: 0xa
[    6.396762] [drm:intel_dump_pipe_config], port clock: 162000
[    6.396762] [drm:intel_dump_pipe_config], pipe src size: 1600x900
[    6.396764] [drm:intel_dump_pipe_config], gmch pfit: control: 0x00000000,
ratios: 0x00000000, lvds border: 0x00000000
[    6.396765] [drm:intel_dump_pipe_config], pch pfit: pos: 0x00000000, size:
0x00000000, disabled
[    6.396766] [drm:intel_dump_pipe_config], ips: 0
[    6.396766] [drm:intel_dump_pipe_config], double wide: 0

This is probably yet another bug about eDP 18bpp configuration.

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