09-03-2011 03:12 AM
I was just going to try that version for W520, but I guess there's no need anymore. Random sleep problem is not so severe with this laptop. Probably the latest bios and other updates have done something for this issue, also for your machine Bardamu. Since those updates, random sleep has occured here maybe just once or twice.
After several months, there's still no "official" reply from Lenovo staff for this problem... This sucks.
09-05-2011 01:33 PM
Unfortunately the same problem here.
The L520 I'm having here is the first we introduced in our company, and it is by great lengths superior to the L512's we had been giving out in the last year. But the constant fan buzz is just awful. This laptop has an idling second generation i5 and intel graphics - it should actually be possible to cool that machine passively. If the fan was only slower, it would help a lot.
The energy-settings seem to be fine, at least the powercfg -energy command didn't show any curious problems.
Lenovo, can't you please look into this? How is it possible nobody realized this while testing the laptop?
So yeah, we really need to get a BIOS-fix, again, to not to be annoyed by our Thinkpads (remember the L512-speedstep issue where one of the CPU cores was constantly overclocked?).
Please Lenovo, look into this. This issue is nerve-wrecking.
09-23-2011 01:33 AM
About the sleep issue. I found for example these event at event viewer when random sleep occurs:
The system is entering sleep.
Sleep Reason: Application API
The system time has changed to 2011-09-22T14:15:20.500000000Z from 2011-09-22T14:14:34.462154100Z.
The \Device\NDMP4 service entered the Intel(R) WiFi Link 1000 BGN state.
4. Power troubleshooter
The system has resumed from sleep.
Sleep Time: 2011-09-22T14:14:30.017899900Z
Wake Time: 2011-09-22T14:15:23.043145400Z
Wake Source: Unknown
I did some changes to bios and windows settings, let's see if those help. If we had a bios option to disable sleep states, I guess this problem could be solved. Unfortunately we don't have those options.. So any fix coming?
11-07-2011 07:12 AM
Still no bios fix or Lenovo acknowledgement of the constant fan, but the creator of TPFancontrol responded in another forum:
it's an incompatibility problem of lenovo software (powermanager, hotkeymanager) and TPFanControl, as the access to EmbededController is not coordinated, as I wrote in .ini
// advice for programmers: TPFanControl must acquire mutex named
// "Access_Thinkpad_EC" to get access to embedded controller
.... lenovo is neglecting this piece of advice
If Lenovo is unwilling to fix the fan behavior directly, perhaps they could implement this advice, so we could at least use TPFancontrol to silence our fans.
I tried uninstalling the mentioned Lenovo progams, powermanager and hotkeymanager, but that didn't do anything except derive me of functionality.
11-09-2011 11:35 AM
I tried uninstalling that driver before, but I guess it didn't work, because I wasn't doing if from a boot to safe mode.
I've just now booted to safe mode and uninstalled the driver, so I'm hoping this will work.
12-07-2011 07:50 AM
12-08-2011 11:36 AM
I disabled all Lenovo power systems using Autoruns (thanks to troubadix!). By doing that random sleep problem seems to be gone. At the same time I lost on-screen volume display and some other on-screen notifications too. I can't test the laptop thorougly because my gf has it in Germany. Does anybody know which of those disabled power systems affect on-screen display? Secondly, if I enable that one, does it make sleep problem come back?