Same here for the following system upgraded to 15.04 from 14.10 yesterday...
System Information Manufacturer: Dell Inc. Product Name: XPS L421X Version: A04 Serial Number: JG74GS1 UUID: 4C4C4544-0047-3710-8034-CAC04F475331 Wake-up Type: Power Switch SKU Number: xxx123x#ABA Family: 103C_5335KV This also seems relevant... Handle 0x0028, DMI type 27, 14 bytes Cooling Device Temperature Probe Handle: 0x0029 Type: Fan Status: OK OEM-specific Information: 0x00000000 Nominal Speed: 0 rpm # while the fan is audibly running! Handle 0x0029, DMI type 28, 22 bytes Temperature Probe Description: Temperature Probe Location: Processor Status: OK Maximum Value: Unknown Minimum Value: Unknown Resolution: Unknown Tolerance: Unknown Accuracy: Unknown OEM-specific Information: 0x00000000 Nominal Value: 2594.0 deg C -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448441 Title: After upgrade to Ubuntu 15.04, wrong temperature readings after wake from suspend cause fan to go crazy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1448441/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs