[Openchrome-devel] [Bug 87061] 1600x1200 resolution breaks at startup, but works later with xrandr

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87061

Xavier Bachelot <xavier at bachelot.org> changed:

           What    |Removed                     |Added
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                 CC|                            |xavier at bachelot.org

--- Comment #5 from Xavier Bachelot <xavier at bachelot.org> ---
I think what happens is the following : the initial resolution is set to
1600x1200 at 75Hz, which exceed the memory bandwidth limit. When xrandr set the
resolution, it set the mode to 1600x1200 @60Hz, which does not exceed the
bandwidth.

The 1600x1200 at 75 mode is validated in iga1_crtc_mode_fixup by
ViaFirstCRTCModeValid, but then rejected by the later bandwidth check. One
would expect it then fallback to the next available mode in the EDID, that is
1600x1200 at 60, but it seems that doesn't happen. I'll try to dig more to
understand what happens, but I'm stuck for now.

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