On 10/17/2012 04:30 AM, Ben Widawsky wrote: > On Tue, 16 Oct 2012 15:19:26 +0200 > Jonas Jelten <jelten at in.tum.de> wrote: > >> Hi list! >> >> I think i've got a problem with the intel driver: >> >> Sometimes, I think especially after running graphics intense >> applications, RC6 is disabled completely and heats up my Thinkpad >> X220t to 90 degree celsius, while idling. >> >> At first I thought that this is a CPU frequency scaling issue, as the >> cpufreq_powersave claims to be running at 800 MHz, but i7z >> (http://code.google.com/p/i7z/) shows all multipliers to be 25 -> 2.5 >> GHz CPU clock. >> >> Powertop 2.1 reveals that the GPU is 100% active, 0% RC6, 0% RC6p and >> 0% RC6pp, and the CPU is 99,9% in C7-deep-sleep, at maximum frequency. >> /sys/kernel/debug/dri/0/i915_ring_freq_table also pointed the issue to >> being caused by the GPU. > > Do you mean the GPU is 0% active? If you really mean 100% then the > results are expected, though I'm not sure how powertop attempts to > calculate the GPU activity. I'm guessing it's just 100 - rc6 > state percentage, which when rc6 works is probably pretty close to > reasonable. > >> >> intel_gpu_top shows a total idle. > > This indicates the above assumption is true. > >> >> I'm on ArchLinux, Kernel 3.6.2, xf86-video-intel-git >> b42d81b63f5b6a571faffaadd42c74adce40128a, this is 2.20.10. >> Problem first occured with Kernel 3.6.0. >> Core i5-2520M HD 3000 > > Obviously a bisect of the exact failing commit would be fantastic. > >> >>> cat /proc/cmdline >>> cryptdevice=/dev/sda2:cryptroot root=/dev/mapper/cryptroot ro vga=791 >>> i915.i915_enable_rc6=7 i915.modeset=1 i915.lvds_downclock=1 >>> i915.semaphores=1 drm.vblankoffdelay=1 init=/bin/systemd >>> initrd=../initramfs-linux.img BOOT_IMAGE=../vmlinuz-linux > > First and most obvious, do not set rc6=7. If you do, do not file > bug reports with those results. RC6++ is known to be extremely broken, > and why we let users so easily hurt themselves is probably something we > need to remedy. On HD3000, even rc6+ is highly recommended against. > >> >> Sometimes it can be fixed by going to pm-suspend and waking up. A >> reboot always fixes it, until it randomly locks up the GPU again. >> >> Please help me how i can do further investigation to catch the bug. > > If you can reproduce it with rc6=1, then it echoes some other bugs > we're trying to track down. Figuring out the most minimal test case to > make it occur would be helpful. Also you can search the mailing list > for RPS related patches which seem to be related. Trying some of those > and reporting your results would be helpful. > > Double check your dmesg for any GPU hangs which may have occurred before > the laptop becomes a space heater. > > >> >> As this makes my Laptop consume ~40W, it would be really nice if this >> gets fixed. >> >> >> Cheers, >> >> Jonas >> >> > others are also suffering: https://bugs.archlinux.org/task/32025 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 897 bytes Desc: OpenPGP digital signature URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20121019/4002b43b/attachment.pgp>
