On Thu, Jan 19, 2012 at 02:48:52PM -0500, Alex Deucher wrote: > On Thu, Jan 19, 2012 at 12:18 PM, Seth Forshee > <seth.forshee@xxxxxxxxxxxxx> wrote: > > I'm seeing several issues related to the radeon driver on a MacBook Pro > > 8,2 with the following graphics card: > > > > ATI Technologies Inc Whistler [AMD Radeon HD 6600M Series] [1002:6741] > > > > All problems were observed when using kernel version 3.2.1. None are > > seen when using fglrx. > > > > 1. Excessive power draw. When using the radeon driver ACPI reports a > > power draw of about 30W on an idle desktop. Using fglrx brings this > > number down to 15W. > > The power saving features of the open source driver are not yet as > good as the closed source driver. Please see the power management > section of this page (http://wiki.x.org/wiki/RadeonFeature) for more > info on the options currently available. The dynpm option makes a small difference, saving about 2W. I did notice an ocassional flash on the screen with this option, and the same flash each time I changed the power options. The only thing that improves things significatnly is the "low" profile method, which gets it down to about 18.5W. > > 2. Occasional long delays when suspending. When this happens I see > > messages like following in dmesg: > > > > [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting > > [drm:atom_execute_table_locked] *ERROR* atombios stuck executing D44E (len 62, WS 0, PS 0) @ 0xD46A > > > > Sometimes one of suspend or resume hangs completely, but I can't > > tell which and am not sure whether or not it's related. I'm also > > testing a Mac Mini with the exact same card which does not seem to > > suffer from this issue. > > > > I ran a bisections that identified f8d0edd (drm/radeon/kms: improve > > DP detect logic) as introducing problems with suspend, and reverting > > this patch on top of 3.2.1 does seem to eliminate both issues. > > > > That patch doesn't really affect the modesetting paths directly; it > looks like a red herring to me. Perhaps. I just started a run of 200 s3 cycles with the patch reverted to see if I can reproduce the issues. I can usually trigger the problem with 15 or fewer s3 cycles. > > 3. When the LVDS panel is powered off and back on, the display > > flickers, as if the backlight is cycling rapidly between low and > > high brightness. If the panel is left on this effect gradually > > lessens and is eventually no longer noticable. This is not seen with > > fglrx. > > > > For the sake of tracking this properly, it would probably be best to file a bug: > https://bugs.freedesktop.org > Product: DRI > Component: DRM/Radeon > What connectors does your card actually have on it? Please attach a > copy of your dmesg output and vbios: > (as root) > (use lspci to get the bus id) > cd /sys/bus/pci/devices/<pci bus id> > echo 1 > rom > cat rom > /tmp/vbios.rom > echo 0 > rom > > Also, keep in mind that this is a mac so it's likely there may be > wonky mac specific problems. I filed bug #44955 for the flickering issue. Thanks, Seth _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
