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APM_DISPLAY_BLANK freezes Thinkpad R40 and Sony Z1 on suspend

APM ERROR-REPORT Ruben Puettmann 2 participants 2 messages Aug 4, 2003

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Ruben Puettmann

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enable CONFIG_APM_DISPLAY_BLANK on linux 2.4.22-pre10 and 2.4.22-pre10-ac1 freeze my Thinkpad R40 with Ati Mobile 7500 and Sony Z1 on apm -s.

Ruben

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Ruben Puettmann
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Quoted 3 lines · Ruben Puettmann

enable CONFIG_APM_DISPLAY_BLANK on linux 2.4.22-pre10 and 2.4.22-pre10-ac1 freeze my Thinkpad R40 with Ati Mobile 7500 and Sony Z1 on apm -s.

If you have UP_APIC or SMP enabled, then this is a known user-bug. CONFIG_APM_DISPLAY_BLANK, CONFIG_APM_CPU_IDLE, and configuring APM as a module instead of built-in, are known to do really bad things with regard to BIOSen and the local APIC.

The fix, if you have APIC or SMP support, is to NOT misconfigure APM.

/Mikael