| Summary: | pwm1[_enable] faults after hibernate/restore related to automatic (or otherwise) fan management | ||||||||
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| Product: | xorg | Reporter: | Mr-4 <mr.dash.four> | ||||||
| Component: | Driver/nouveau | Assignee: | Nouveau Project <nouveau> | ||||||
| Status: | RESOLVED DUPLICATE | QA Contact: | Xorg Project Team <xorg-team> | ||||||
| Severity: | normal | ||||||||
| Priority: | medium | ||||||||
| Version: | unspecified | ||||||||
| Hardware: | Other | ||||||||
| OS: | All | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
| Attachments: |
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Thanks for the report Please attach the output of dmesg, after a hibernate/resume cycle. Does the issue occur on suspend/resume? Created attachment 81189 [details] [review] fix for bug#1 This patch should resolve the first bug. Please give it a try and as usual observe the temperatures Cheers Emil Created attachment 81291 [details] [review] Allow "automatic" fan mode from the start (In reply to comment #2) > This patch should resolve the first bug. Please give it a try and as usual > observe the temperatures OK, I've had mixed results so far. The patch does work, but not always - sometimes even though the hibernate/restore is successful (and the fans are running at low speed from the beginning) my system locks up completely, usually a few seconds after restore has done its job. I'll keep testing this and post any new developments. In the meantime, I just attached a patch of my own - I've modified nouveau_pm.c to start in "automatic" fan mode from the very start. That is made possible by specifying "nouveau.therm_fan_mode_auto=1" as kernel parameter, so that I don't have to rely on my rc.local and other such scripts. Some more feedback on this, after I was able to test this more thoroughly: The automatic thermal management seems, at least for my card (Chipset G71 - NV49), completely buggy! After hibernate/resume, when my machine doesn't lock up a few seconds after restore is complete (see Comment #4), I also get the following possible scenarios developing: pwm1=0 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=28000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 [...] pwm1=0 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=52000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 As evident, pwm1_enable is restored, but the nouveau driver doesn't seem to bother with any sort of fan management at all (the pwm1 is reduced from 100 to 0 after restore and it stays there for ever!). When I do this: echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable I still get: pwm1=0 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=55000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 Next, I tried the following sequence: echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable pwm1=26 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=53000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 [...] pwm1=26 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=47000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 As evident, the pwm1 "twitched" for a bit, and then "froze" at 26%, reducing the card temperature from about 55 degrees to 47. I then did this: echo 1 > /sys/class/hwmon/hwmon0/pwm1_enable echo 100 > /sys/class/hwmon/hwmon0/pwm1 echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable pwm1=88 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=44000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 [...] pwm1=13 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=47000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 pwm1=13 pwm1_enable=2 pwm1_max=100 pwm1_min=0 temp1_auto_point1_pwm=100 temp1_auto_point1_temp=90000 temp1_auto_point1_temp_hyst=3000 temp1_crit=115000 temp1_crit_hyst=2000 temp1_emergency=135000 temp1_emergency_hyst=5000 temp1_input=58000 temp1_max=95000 temp1_max_hyst=3000 update_rate=1000 Again, pwm1 "froze" at a value of 13 and stayed there. Since I do not want to burn my card out, I then switched to manual and set the pwm1 value to 100. There are 3 additional bugs I discovered also, but will submit a separate reports (and patches) for these. |
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This is a collection of 2 bugs, which I think are related (hence why I am reporting them both here) as they both happen as a result of hibernate/restore: 1. After a hibernate/restore cycle, the fan management option (the value of pwm1_enable) is not restored; and also 2. After a hibernate/restore cycle, when automatic fan management is applied ("echo 2 > .../pwm1_enable"), this doesn't work - the nouveau driver takes the fan speed to 2 and keeps it there *regardless* of the temperature of the video card, which may cause the card to BURN OUT! The kernel in use is 3.9.6 with the stock-supplied nvidia driver. For more details please see https://bugzilla.redhat.com/show_bug.cgi?id=976658