Created attachment 172931 [details] dmesg output, DSDT Tried to run Arch Linux on Linx 7 (http://www.linx-tablets.com/linx-7.html), works/boots on 3.14.37-1-lts kernel. When I upgrade to kernel 3.15> <=3.19, I can only boot with acpi=off as kernel parameter. Unfortunately it hangs/freezes at initial ramdisk (on upgraded kernel), and I'm unable to provide any (display) output. So I have provided output/debug info from the 3.14 kernel. Many Thanks! PS. Reason for upgrade: touchscreen support (Goodix), drivers, fixes for btrfs, etc.
Do I understand correctly that with acpi=off, you can boot till initial ramdisk, then hang; without acpi=off, system doesn't boot?
Hello Aaron, Forget to update the report, booting works fine with: noefi reboot=pci,force irqpoll noefi: doesn't boot without it reboot=pci,force: required for rebooting irqpoll: fix irq warnings Also tried to boot with other acpi flags, but had no effect (freeze at initial ramdisk). Broken BIOS? Thanks for looking at this issue. :)
(In reply to beta990 from comment #2) > Hello Aaron, > > Forget to update the report, booting works fine with: noefi reboot=pci,force > irqpoll > > noefi: doesn't boot without it In comment #1, you have mentioned acpi=off. Is it no longer necessary with noefi? > reboot=pci,force: required for rebooting Seems to be common for Baytrail-T platforms, ASUS T100 is also the same. > irqpoll: fix irq warnings Not sure about this.
(In reply to Aaron Lu from comment #3) > (In reply to beta990 from comment #2) > > Hello Aaron, > > > > Forget to update the report, booting works fine with: noefi > reboot=pci,force > > irqpoll > > > > noefi: doesn't boot without it > > In comment #1, you have mentioned acpi=off. Is it no longer necessary with > noefi? > > > reboot=pci,force: required for rebooting > > Seems to be common for Baytrail-T platforms, ASUS T100 is also the same. > > > irqpoll: fix irq warnings > > Not sure about this. > In comment #1, you have mentioned acpi=off. Is it no longer necessary with > noefi? Correct, this are the flags I use to boot successfully: noefi reboot=pci,force irqpoll However when using acpi=off instead of noefi, it boots but it cannot find the HDD/eMMC. > > reboot=pci,force: required for rebooting > > Seems to be common for Baytrail-T platforms, ASUS T100 is also the same. Thanks, indeed found this flag on an ASUS T100 topic. If you need any more info, please let me know. :)
(In reply to beta990 from comment #4) > (In reply to Aaron Lu from comment #3) > > (In reply to beta990 from comment #2) > > > Hello Aaron, > > > > > > Forget to update the report, booting works fine with: noefi > reboot=pci,force > > > irqpoll > > > > > > noefi: doesn't boot without it > > > > In comment #1, you have mentioned acpi=off. Is it no longer necessary with > > noefi? > > > > > reboot=pci,force: required for rebooting > > > > Seems to be common for Baytrail-T platforms, ASUS T100 is also the same. > > > > > irqpoll: fix irq warnings > > > > Not sure about this. > > > In comment #1, you have mentioned acpi=off. Is it no longer necessary with > > noefi? > Correct, this are the flags I use to boot successfully: noefi > reboot=pci,force irqpoll From the kernel-parameters document, the noefi is used to disable EFI runtime service, I'm not familiar what EFI runtime service Linux currently makes use of, need to check this. > > However when using acpi=off instead of noefi, it boots but it cannot find > the HDD/eMMC. I suppose that is because the eMMC controller is listed in the ACPI table(instead of as a PCI device) and if ACPI is disabled, it can't be enumerated/probed. So with the above kernel cmdline, I suppose everything works well?
Hi Aaron, Yep, it now works fine now. :) When I opened the request, I hadn't found/tested the noefi flag. Seems this fixes a lot of issues on the board/BIOS. reboot=pci,force irqpoll flags are still needed, can't only concluded the board isn't 100% compatible with Linux. But the workarounds work fine. ;) Will close the report, since it seems more boards have these (EFI) problems. Thanks for the support.