FS#4149 - xf86-video-ati and xinerama broken

Attached to Project: Arch Linux
Opened by Mathias Nedrebø (lessthanjake) - Saturday, 11 March 2006, 09:01 GMT
Last edited by Tobias Powalowski (tpowa) - Saturday, 11 March 2006, 13:45 GMT
Task Type Bug Report
Category Packages: Current
Status Closed
Assigned To Jan de Groot (JGC)
Architecture not specified
Severity Low
Priority Normal
Reported Version 0.7.1 Noodle
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

The X.org radeon driver supplyed by xf86-video-ati does not work propperly in xinerama mode.
Xinerama is actually working as supposed, but one screen is black. I can move windows
onto the black screen, and if I capture a screenshot it displays the hole extended
desktop. Both screens is vorking in console an clone-mode. The problem is dicussed here:
http://bbs.archlinux.org/viewtopic.php?t=19235

- Mathias Nedrebø
This task depends upon

Closed by  Jan de Groot (JGC)
Saturday, 29 April 2006, 21:55 GMT
Reason for closing:  Fixed
Additional comments about closing:  Fixed in latest release, both heads are enabled all the time now.
Comment by Jan de Groot (JGC) - Saturday, 11 March 2006, 11:28 GMT
This bug is known upstream, haven't seen a solution for it yet.
What you could try is MergedFB with Xinerama emulation instead of true xinerama. I'll upload my xorg.conf which contains the needed configuration for it. Though my config is for mga, it should be the same for your configuration, as the mga driver on archlinux uses an unofficial patch which has been ported from the radeon and sis drivers.

The advantage of using MergedFB over true Xinerama is that it's quite much faster and you don't loose DRI. With true Xinerama X has to maintain 2 framebuffers with 2 viewports, with MergedFB + Xinerama emulation, you have 1 framebuffer with 2 viewports, which removes quite a lot of overhead.
Comment by Jan de Groot (JGC) - Sunday, 12 March 2006, 00:53 GMT
Updated Xorg.conf that works fine.
(application/octet-stream)    xorg.conf (4.5 KiB)
Comment by Jan de Groot (JGC) - Monday, 17 April 2006, 23:12 GMT
Please try the latest version in testing (up2date libdrm 2.0.1 from current required, no other special requirements). The driver in testing has several fixes.
Comment by Ørjan Pettersen (orjanp) - Thursday, 20 April 2006, 09:44 GMT
Didn't work. Still black screen.

To me, the MergedFB alternative makes things go slower. Scrolling and moving windows ofen takes a long time. Maybe my gpu card is to weak. ATI Radeon 7500, w/16 MB ram.

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