[Bug 19960] radeon{,hd} driver can't run a LCD at certain resolutions/timings over DVI

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19960


Howard Chu <hyc at symas.com> changed:

           What    |Removed                     |Added
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                 CC|                            |hyc at symas.com




--- Comment #32 from Howard Chu <hyc at symas.com>  2009-11-08 12:15:04 PST ---
This sounds pretty similar to the problems I'm having, trying to get
1920x1200 at 60 working on my laptop with HD3450. The screen looks OK on bootup,
and looks perfect in the GRUB menu. When the kernel loads (2.6.32-rc6) I start
to see horizontal streaks across the text, and after the text scrolls down to
about half of the screen it goes black.

If I then load the radeon module with modeset=1 and load fbcon, the console
looks good. But if I fill the console with a lot of colors, the streaking can
occur and it will just go black as well. (Try running vlc to play a movie in
text mode.)

If I startx, I see the mouse cursor for a few seconds as things initialize, and
sometimes I get a glimpse of the desktop before the screen goes black. Using
xrandr I can sometimes set the screen to 1920x1200 at 50 and see the display, but
again it's got lots of horizontal streaks across it, and other display content
will make it black out again.

Most of the other modes don't work at all, or they're shifted right about 1",
and again lots of horizontal streaks.

I'll try playing with the PLL settings.


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