On Tue, Jan 20, 2015 at 5:16 AM, Jeffrey Langerak <jeff...@langerak.it> wrote: > Hi, > >> Does disabling ColorTiling2D or ColorTiling work around the problem? If >> not, please provide the corresponding Xorg log file. > > Disabling the "ColorTiling" option seemed to fix the issue, according to the > "radeon" manpage this should default to off for this chipset (RS690), but X > will default it to on. Forcing it to "off" was sufficient and dual screen is > now working! ColorTiling2D is a safe option for this chip and may be set to > on.
You may have an outdated man page. ColorTiling2D has no affect on that asic. > > Now that we are discussing this, are there any other options that are useful > to place in the xorg.conf file to boost the speed of the GPU like > acceleration enhancements? > > One other thing I noticed and is probably because of the VRAM limitation of > 32MB is that when using the 2 full-HD monitors is that the display sometimes > shows some interlacing and the monitor connected to the DVI port will loose > the connection for about a second. Any thougths about that? Probably underflow to the displays due to memory bandwidth contention or a problem with the watermark setup on the displays. Does setting radeon.disp_priority=2 on the kernel command line in grub help? I'm not sure there is enough memory bandwidth to drive two full HD displays on that asic. Alex > > Someone asked about the VRAM limit, this is fixed because the machine is a > thin client, the bios does not allow any changes herein, I can only set the > "vmalloc" parameter when booting the kernel. > > Thanks again! > > Kind regards, > > Jeffrey Langerak > _______________________________________________ > xorg@lists.x.org: X.Org support > Archives: http://lists.freedesktop.org/archives/xorg > Info: http://lists.x.org/mailman/listinfo/xorg > Your subscription address: %(user_address)s _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
