Problems with fglrx

This page discusses issues with the ATI proprietary fglrx display driver.

Known Troubles and Solutions

No hardware acceleration

If the ATI driver works only without the hardware acceleration, take into consideration that fglrx_dri.so was linked against libstdc++.so.5 which may not be present if your system uses gcc-3.4.

To fix this, compile gcc-3.3.5 and copy libstdc++.so.5* to /usr/lib and update the dynamic linker cache via # ldconfig.

Another possible cause for broken hardware acceleration (2D and 3D) is the radeonfb framebuffer: Switching to vesafb or vesafb-tng is reported to solve the problem on some systems. Also it has proven helpful to not perform # modprobe fglrx after boot but to have the module loaded via /etc/modules.autoload/kernel2.x at boottime instead.

Softlink hell

The fglrx installer replaces the standard X.org OpenGL implementation (Mesa) with its own files, potentially causing collisions with the distribution's file and package management. It is best to install the driver via a package built for your distribution, which will typically include the necessary kludges to make things work. See the fglrx page for pointers.

Discussion

If you install the driver and type "fglrxinfo" which shows you are still using the mesa indirect software GL renderer, you likely have some misplaced softlinks. I find this *really* frustrating, and do not know why it occasionally occurs -> I think it has to do with an apt-get upgrade that sometimes replaces these links. Anyway, go to

cd /usr/X11R6/lib

and list your GL libraries and links

ls -la *GL*

You should see something like:

libGL.so -> libGL.so.1.2

and

libGL.so.1 -> libGL.so.1.2

If you see a link to a mesa library (something like ->libGL.mesa.1.2), then that's your problem! Restore the softlink with a command similar to:

ln -s <actual file> <softlink name>

e.g.

ln -s libGL.so.1.2 libGL.so.1

For some reason, this link might "break" later, giving you the software rendering once more. I renamed the mesa library to mesa.bkup, and the system still found it and linked to it despite the name change. If you have to do this a lot, you could write a restoreGL script...

Troubles using software suspend

When the computer resumes from suspend, X only displays a garbled image and the computer is frozen. The problem is acknowledged in ATI's release notes and in knowledge base entry 737-218. Driver version 8.19.10 has "initial support for Suspend and Resume" but is working very nicely for most people (verified on T43, T43p and T42) without vbetool.

If you are using an older version of fglrx, using vbetool to save/restore the video card state before/after suspend worked for some people. If you use Software Suspend 2 (suspend2) scripts, you can simply uncomment EnableVbetool yes in /etc/hibernate/hibernate.conf. Be aware though that it breaks suspend/resume for drivers beginning with version 8.19.10, so remember to disable it again when upgrading.

tested with the following configurations

model	distro	kernel	fglrx	PM	success	comments
T42	SUSE 9.3	2.6.11	8.14.13	swsusp	yes
T41p	???	2.6.14	8.19.10	suspend2 2.2-rc9	yes	needs a small patch
T42p	Debian	2.6.10	Debian packaged	suspend2	yes
T43	Debian sid	2.6.14.2	8.19.10	swsusp	yes	works perfectly with 8.19.10 (but not earlier versions!)
T43	Debian etch	2.6.14.2	8.19.10	swsusp	yes	works perfectly with 8.19.10 and without vbetool
T43	Ubuntu Breezy	2.6.12-10	8.19.10	swsusp	yes	Perfect. (Finally.)
T43	FC4	2.6.14.1	8.19.10	suspend2 2.2-rc9	yes	needs a small patch, requires DRI disabled in xorg.conf (hence no 3D acceleration)
T43	FC4	2.6.14.2	8.19.10	suspend2 2.2-rc11	yes	requires DRI disabled in xorg.conf (hence no 3D acceleration)
T43	FC4	2.6.14.3	8.19.10	suspend2 2.2-rc13	no	DRI enabled
T43	FC4	2.6.14.3	8.20.8	suspend2 2.2-rc13	no	DRI enabled
R50p	???	???	8.19.10	swsusp	yes
T43p	Debian sid	2.6.14	8.19.10	Suspend to RAM	yes	without vbetool or UseDummyXServer, those two break the resume process here, with DRI enabled
T43p	Debian sid	2.6.14.3	8.20.8	Suspend to RAM	yes	without vbetool or UseDummyXServer, with DRI enabled

Troubles with large RAM

Version 8.14.13 (and probably earlier versions) of the driver does not seem to be able to cope with large amounts of RAM: with 512 MB it works, with 1.5 GB it crashes the machine as soon as X is started. The problem is present only if the fglrx kernel module is loaded, but independently of whether (CONFIG_HIGHMEM) is enabled. A workaround is to limit RAM by adding the mem=864m kernel parameter.

Version 8.16.20 fixes the problem.

Display switching

The switching between internal and external display doesn't work, because the driver blocks messing around with the chipset via ACPI. If you want to use this feature (i.e. during presentations), you should use the VESA server instead (experienced with a R52, Kernel 2.6.11, xorg 6.8.2, fglrx 8.16.20).

Composite Support

ATI has not officially supported composite windowing (alpha channel) enabling hardware acclerated translucent windows (primarily for 'eye candy.') Enabling Composite in KDE and the fglrx driver results in a very pretty desktop but unacceptably slow performance on a T43p with ATI's FireGL T2. It is still unusable in its current state (as of driver 8.19.10).

ATI promises support in the future when composite is officially supported by Xorg. Discussion of current status of drivers can be found in the Rage3d forums' (rage3d.com/board) Linux area. Rumor has it that the Microsoft Vista will support composite, so hopefully we will see it before then...

Patches

The following patches might be needed for certain versions of fglrx.

• for kernel >= 2.6.13 Missing verify_area bug

V 8.8.25

• for kernels >= 2.6.10
• For kernels >= 2.6.11-rc1

Beta Testing

The fglrx developers are looking for T Series users to take part in their beta program.

If interested, plese contact mtippett (at) ati.com.