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Kernel: DDR4, MacBook Pro Fixes, AMDGPU in Linux 4.18

Submitted by Roy Schestowitz on Monday 8th of October 2018 04:31:57 PM Filed under
Linux
  • Linux Driver Revived For Finally Being Able To Read DDR4 Memory SPD Data

    DDR4 memory has been around for several years already yet the mainline Linux kernel doesn't have a driver for reading the SPD EEPROMs abiding by the JEDEC EE1004 standard as used by DDR4 SDRAM memory modules.

    In November of last year, SUSE developer Jean Delvare sent out a patch for a new "ee1004" driver for reading the SPD (Serial Presence Detect) data on DDR4 memory modules. That patch/driver fell through the cracks while finally Jean has got around to resending out the driver on the kernel mailing list.

  • Linux 4.20 Fixing Bug Where Plugging In A MacBook Pro Leads To Excessive CPU Usage

    The upcoming Linux kernel that will be at either version 4.20 or 5.0 is going to fix a kernel issue that dates back at least a year where plugging-in or even unplugging recent Apple MacBook Pro laptops will lead to excessive CPU resources being consumed... Basically, the charging/uncharging event change for these recent MBP laptops was causing issues within the kernel -- adding to the list of problems Linux faces trying to run on recent Apple hardware.

  • The Linux 4.18 Power Regression Affecting Some AMD Graphics Cards Should Be Reverted

    Making the rounds last week was a nasty power regression hitting Linux 4.18 stable and as we ended up bisecting was caused by a change to the AMDGPU kernel driver and affected select Radeon graphics cards. It looks like the goal this week is to get that patch reverted from Linux 4.18.

    The change causing that big uptick in idle power consumption was boosting the clock values in order to avoid some issues with 4K DP and 1080p HDMI displays sometimes having problems with this open-source AMD kernel driver.

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