Bug 104271
Summary: | Boot crashes on Lenovo W520 with KVM and Discrete Graphic enabled in BIOS | ||
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Product: | Drivers | Reporter: | Hans Streibel (streibel.2003) |
Component: | PCI | Assignee: | virtualization_kvm |
Status: | NEW --- | ||
Severity: | blocking | CC: | alex.williamson, oenhan, streibel.2003, szg00000 |
Priority: | P1 | ||
Hardware: | Intel | ||
OS: | Linux | ||
Kernel Version: | 4.1.6 | Subsystem: | |
Regression: | No | Bisected commit-id: | |
Attachments: | Output of lspci -vvv |
Description
Hans Streibel
2015-09-09 09:05:03 UTC
Does it work well on windows? I guess it's a BIOS problem. finding a avaliable disk device is the job of BIOS, and the problem just right occurs when you change the BIOS settings. Yes, it works on Windows 7. I did not recognize any problems there. Ok, I did not try any virtualization like Virtual Box under Windows, but everything else seems to work. Even if it is a BIOS problem, then Windows obviously found a way to handle it. You might get more attention moving this bug to Drivers/PCI and including the full dmesg or console log of the failure and lspci -vvv so we know something about your system. If it doesn't boot, there are always screen shots or netconsole if you're serial port challenged. KVM is a hypervisor, it has nothing to do with your system not booting. More likely it's something with the IOMMU. Does disabling VT-d help? What about booting with iommu=pt? BTW, reproducing on another W520 doesn't mean the hardware isn't broken, it just means this isn't a point defect. Hardware is broken a disturbing amount of the time. Created attachment 187321 [details]
Output of lspci -vvv
Ok, will move it to Drivers/PCI. Output of lspci -vvv now is in the appendix. Output of dmesg is not included because that only shows output of a successfully booted kernel. I even installed bootlogd but its log file does not show error messages. I made some pictures with my camera but I do not dare to attach those somewhat big jpg files here. But if you really need them I can attach them. The trouble starts (most of the time) right behind the line: shpchp: Standard Hot Plug PCI Controller Driver Version: 0.4 Yes, disabling VT-d did help. Booting succeeded again. Using "iommu=pt" however did not help. Same symptoms. BTW, I wanted to express that my special notebook is not broken. Not more broken that all (many/most) of the others W520s around. As Alex suggested I moved this bug to Drivers/PCI to get more attention. However now I have the impression that this bug does not get any attention at all any more. Did I miss any necessary action beside moving this to Drivers/PCI? |