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18594
May 31st, 2015 20:00
slow CPU after wake from suspend - workarounds
Sometimes the XPS-13 is stuck at 500 Mhz after waking from suspend. I've found 2 ways to work aroundd this:
1. Plug in power - even momentarily. Even after you unplug power, it remains at full speed.
2. Suspend again, then wake again. Most of the time it runs at full speed.
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ubuntuUsr
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June 2nd, 2015 23:00
I have the same problem. After I close and then open the laptop, the CPU is stuck at 500 MHz.
Unplugging the power and then plugging it back in, or closing and then opening the laptop again does not help.
The only solution is to reboot and keep the laptop open.
This is a serious issue and I'll likely return my laptop. I'm using Ubuntu 14.04 LTS
MRC01
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June 3rd, 2015 08:00
Here's one more thing you can try. This problem has not recurred since I added some cmdline parameters to the kernel during boot, in the /etc/default/grub file.
These are the same params Dell put there to begin with. I wanted to run without them to see if they were needed when running kernel 3.19. Since I restored them this problem has not recurred:
GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=force radeon.modeset=0 noveau.modeset=0"
GRUB_CMDLINE_LINUX="noquiet nosplash"