Bug 311721
| Summary: | Power control broken in iwl3945 | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Santtu Pajukanta <santtu> |
| Component: | iwl3945-firmware | Assignee: | Matthias Saou <matthias> |
| Status: | CLOSED CANTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | high | Docs Contact: | |
| Priority: | low | ||
| Version: | 7 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| URL: | http://www.lesswatts.org/tips/wireless.php | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2007-10-22 12:21:16 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
00:15 nirik : Japsu: whats your kernel version? that probibly should be filed against the kernel instead of the firmware. japsu@proomu ~ % uname -a Linux proomu 2.6.22.7-85.fc7 #1 SMP Fri Sep 21 19:53:05 EDT 2007 i686 i686 i386 GNU/Linux Indeed... if this problem persists, please reopen this bug and reassign it to the proper component, which is probably the kernel. |
Description of problem: During normal operation in GNU/Linux (several distributions) the right-hand wrist rest of my Lenovo ThinkPad X60s gets unacceptably hot. The overheating component would seem to be the WLAN adapter (Intel PRO/Wireless 3945). With the ipw3945 driver in another distro I was able to bring the temperature down using "iwpriv wlan0 set_power 7". Several sources, lesswatts.org among them, state that the equivalent command for iwl3945 is "echo 5 > /sys/bus/pci/drivers/iwl3945/*/power_level". This, however, does not work: A) Assume you've already connected to a WLAN (associated with an access point etc.). Entering the above command instantly kills the connection, returns an I/O error to the process trying to write to power_level, writes the following lines to syslog and fails to put the WLAN adapter in power save mode: iwl3945: Microcode SW error detected. Restarting 0x82000008. iwl3945: Error Reply type 0x00000000 cmd POWER_TABLE_CMD (0x77) seq 0x0440 ser 0x00000000 iwl3945: Can't stop Rx DMA. B) Assume you haven't yet connected to a WLAN. Entering the above command succeeds and actually brings the temperature down, but with the little downside that the WLAN adapter stops working until reboot. This time the error in syslog looks like this: iwl3945: Microcode SW error detected. Restarting 0x82000008. iwl3945: Error Reply type 0x00000000 cmd REPLY_QOS_PARAM (0x13) seq 0x04AA ser 0x00000000 iwl3945: Can't stop Rx DMA. Version-Release number of selected component (if applicable): iwl3945-firmware.noarch 2.14.1.5-1 installed Steps to Reproduce: 1. Buy an X60s 2. Install Fedora 7 on it A3. Connect to a WLAN using Network Manager A4. Notice the right-hand wrist rest getting HOT and burn your wrist A5. echo 5 > /sys/bus/pci/drivers/iwl3945/00*/power_level B3. echo 5 > /sys/bus/pci/drivers/iwl3945/00*/power_level B4. Try to connect using Network Manager Actual results: A) WLAN immediately killed ("No route to host"). Reconnecting with Network Damager succeeds, but the power save mode is not activated. B) Power save mode entered, but all further connection attempts fail without an error message. Expected results: The WLAN adapter cools down significantly but keeps functioning normally, perhaps with a small range and/or throughput hit.